Go to my host section - its the link in my signature below this post - there you wil lfind a tutrial on polyrythmics - but thats a different kind of polyrythmics than the one i ust meant in my previous post (of course both are worth beeing practiced)

what i meant was you play all the notes at the same time, only different patterns - the one consisting of 3 notes and the other of 4 notes - so the melody starts turning around and eventually comes back to the start.

like:

1 - 2 - 3 - 4 - 1 - 2 - 3 - 4 - 1 - 2 - 3 - 4
1 - 2 - 3 - 1 - 2 - 3 - 1 - 2 - 3 - 1 - 2 - 3

As you can see when the 4th note of the fist melody is played, you already play the first note of the second melody again. this way the whole thing starts to turn around.